1. #define F_CPU 16000000UL
  3. #include <avr/io.h>
  4. #include <util/delay.h>
  5. #include <avr/interrupt.h>
  7. /******************************************************************************/
  9. int main(void)
  10. {
  11. cli();
  13. DDRD &= ~_BV(DDD0); // set as input
  14. PORTD |= _BV(PORTD0); // enable pull-up
  16. DDRB |= _BV(DDD5);
  17. PORTB |= _BV(PORTB5); // initialize to high
  19. PCICR |= _BV(PCIE2); // set PCIE2 to enable PCMSK2 scan
  20. PCMSK2 |= _BV(PCINT16); // set PCINT16 to trigger an interrupt on state change
  22. sei(); // turn on interrupts
  24. while (1);
  25. }
  27. /******************************************************************************/
  29. ISR (PCINT2_vect)
  30. {
  31. PINB |= _BV(PINB5);
  32. _delay_ms(5);
  33. }
  35. /******************************************************************************/